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受欢迎的代数 >

3k^2+6k=105

解答

3 k^{2} + 6 k = 105

解答

k = 5, k = - 7

求解步骤

3 k^{2} + 6 k = 105

将

105

para o lado esquerdo

3 k^{2} + 6 k - 105 = 0

使用求根公式求解

k_{1, 2} = \frac{- 6 \pm 6 ^{2} - 4 \cdot 3 ( - 105 )}{2 \cdot 3}

6^{2} - 4 \cdot 3 (- 105) = 36

k_{1, 2} = \frac{- 6 \pm 36}{2 \cdot 3}

将解分隔开

k_{1} = \frac{- 6 + 36}{2 \cdot 3}, k_{2} = \frac{- 6 - 36}{2 \cdot 3}

k = \frac{- 6 + 36}{2 \cdot 3} : 5

k = \frac{- 6 - 36}{2 \cdot 3} : - 7

二次方程组的解是:

k = 5, k = - 7

作图

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